OSLO (Reuters) - Norway has electronic proof that Russian forces disrupted global positioning system (GPS) signals during recent NATO war games, and has demanded an explanation from its eastern neighbor, the Nordic country's defense minister said on Monday.

The White House is drafting a proposal that would demand allied countries not just foot the bill for U.S. service members deployed within their borders, but an additional 50% "for the privilege of hosting them," Bloomberg News reports.

US Army soldier takes a selfie during a UH-60 Black Hawk helicopter flight over the Black Sea. (U.S. Army/William B. King)

Enemies can use social media to not only inexpensively find and target NATO forces — but also manipulate them, new research has concluded.

Researchers with NATO's Strategic Communications Center of Excellence used open source data, primarily social media, to successfully identify 150 soldiers, locate multiple battalions, track troop movements, and even convince service members to leave their posts and engage in other "undesirable behavior" during a military exercise, Wired reported Monday, citing a StratCom report.

And they did it for only $60, demonstrating how easy it is for an aggressor to target NATO with data available online.